the 'true back tension' release mentioned above may be good for those that pull thru the shot, but when properly ececuting back tension there really isn't added tension on the release, string, or bow. the movement of your releaseelbow isn't in line with the arrow, it is perpindicular to it. the angle of the release is changed by constricting the rhomboid. this is very different than pulling thru a shot, which is done with the arm and shoulder. when the rhomboid contracts - if everything else is relaxed, and your neck is vertical (the scapula can not get the rhomboid to execute the function if the neck is not vertical) the angle of the release changesand the mechanism releases at an unknown time, making it impossible to drop you bow arm. pulling thru a shot makes dropping your bow arm impossible because of the added tension. the one is easy to learn, the other takes a long time.one is push and pull, the other is back tension. just my 2 cents.